losing TextBox.Text (ViewState) from page that inheriting from 2 levels of master pages

i have a page (Asp.net 3.5) that it inheriting goes as follow: Main.master -> Submaster.master -> page.aspx when i postback to the server after filling some textbox in page.aspx it value stays empty

It should be noted that viewstate on Main.master -> otherpage.aspx works perfect开发者_运维技巧lly and the EnableViewState on Submaster.master is set to true

any ideas plesae?